* src/transform.c (load_file): fix segfault when storing span in NULL tree
* src/transform.c (load_file): fix segfault when storing span in NULL tree

mlichvar/augeas,kunkku/augeas,MikaelSmith/augeas,kunkku/augeas,kumy/augeas,dafugg/augeas,GeoffWilliams/augeas,pevalme/augeas,lutter/augeas,jasperla/augeas,GeoffWilliams/augeas,hercules-team/augeas-do-not-use,jtopjian/augeas,jjlin/augeas,hercules-team/augeas,hercules-team/augeas,mlichvar/augeas,kunkku/augeas,jtopjian/augeas,jjlin/augeas,hercules-team/augeas-do-not-use,mchf/augeas,jasperla/augeas,hercules-team/augeas-do-not-use,manandbytes/augeas,raphink/augeas,dafugg/augeas,kumy/augeas,pevalme/augeas,domcleal/augeas,manandbytes/augeas,pevalme/augeas,mlichvar/augeas,lutter/augeas,ptoscano/augeas,kumy/augeas,ptoscano/augeas,domcleal/augeas,MikaelSmith/augeas,domcleal/augeas,raphink/augeas,jjlin/augeas,dafugg/augeas,kumy/augeas,lutter/augeas,ptoscano/augeas,mchf/augeas